|
Warrants (Narrative) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Summary Activity In Gold Bullion [Line Items] | |||
| Outstanding warrants | 830,750 | 830,750 | 830,750 |
| Warrants granted, exercise price per share | $ 20.00 | $ 20.00 | $ 20.00 |
| Warrant, contractual term (in years) | 10 years | ||
| Fair value of the warrants | $ 3,300 | $ 6,300 | |
| Gain (loss) from the change in fair value of warrant liability | $ (2,953) | $ 820 | $ (1,385) |
| Minimum [Member] | |||
| Summary Activity In Gold Bullion [Line Items] | |||
| Expiration dates of the warrants range | Oct. 20, 2019 | ||
| Maximum [Member] | |||
| Summary Activity In Gold Bullion [Line Items] | |||
| Expiration dates of the warrants range | Sep. 30, 2020 | ||